721045540127 has 4 divisors (see below), whose sum is σ = 786595134696. Its totient is φ = 655495945560.

The previous prime is 721045540123. The next prime is 721045540141.

It is a happy number.

721045540127 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721045540127 - 2² = 721045540123 is a prime.

It is a super-2 number, since 2×721045540127² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721045540123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32774797268 + ... + 32774797289.

It is an arithmetic number, because the mean of its divisors is an integer number (196648783674).

Almost surely, 2^721045540127 is an apocalyptic number.

721045540127 is a deficient number, since it is larger than the sum of its proper divisors (65549594569).

721045540127 is a wasteful number, since it uses less digits than its factorization.

721045540127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65549594568.

The product of its (nonzero) digits is 78400, while the sum is 38.

The spelling of 721045540127 in words is "seven hundred twenty-one billion, forty-five million, five hundred forty thousand, one hundred twenty-seven".